Abstract
This chapter presents the general Radio Resource Management (RRM) problem in wireless access networks and gives performance evaluations for different downlink resource (sub-carrier) allocation algorithms in WiMAX TDD systems based on OFDMA wireless access. This is particularly important in downlink due to the traffic asymmetry and due to the information availability at the base station regarding the quality requirements for a particular user. The comparative performance analysis of the different resource allocation algorithms is using the average cell/user throughput and user throughput versus distance from the reference base station as performance metrics. For the comparative performance evaluation, we have resorted to MATLAB simulations. Additionally, a semi-analytical approach is proposed for the downlink throughput performance estimation of the algorithms that do not rely on the channel quality information feedback from the mobile users. The analysis shows that Proportional Fair and Soft partitioning/re-use algorithms are good candidates for downlink resource allocation in WiMAX TDD systems and that the proposed semi-analytical approach accurately estimates the throughput performance of the reuse schemes.
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Notes
- 1.
It is normalized in a sense that all users have average sub-carrier power E[P(k)] = 1 over all sub-carriers.
- 2.
Note that in the simulation studies in Section 7.5 the frequency selective multi-path is taken into account in order to show the performance gain of Proportional Fair and Maximum C/I allocation algorithms. These algorithms utilize the frequency selectivity of the radio channel in the allocation of the resource units. However, the frequency selective multi-path is not considered in the semi-analytical approach because the focus is first on the Reuse-One, Reuse-Three and Soft Reuse algorithms that do not utilize the frequency selectivity of the radio channel for the allocation decisions. This is left for further study.
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Jorguseski, L., Prasad, R. (2010). Radio Resource Management in WiMAX Networks. In: WiMAX Networks. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-8752-2_7
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DOI: https://doi.org/10.1007/978-90-481-8752-2_7
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